I like both of them, for different reasons. I like CK because it seems to add lots of extra definition for me and reduced frizz quite a bit. I'm one to layer one or two products together, and I love that CK layers with anything. It's also really easy to distribute, which is great for a clutz like me. The scent isn't my favorite, but after it dries I don't notice it.

RR is really good for curl enhancement, but the drawback is that I need a lot of it to distribute through my hair. It works pretty well with either a gel or with the CCSS for me, though I do have a hard time figuring out how much of each to use. I've had a lot of great hair days with RR, though, and I love Jessicurl's scents.
With your feet in the air and your head on the ground
Try this trick and spin it, yeah
Your head will collapse
If there's nothing in it